Implementation of Shell Sort Algorithm in C2 min read

In this tutorial, we will write a C program to implement shell sort. Before that, you may go through the following topics in C.

Shell Sort Algorithm

Shell sort is an in-place comparison-based sorting algorithm and variation of Insertion sort. It is a better version of Insertion sort in comparison-based. It can compare the elements far apart whereas Insertion compares adjacent elements.

In shell sort, we make the array h-sorted for a large value of h. We keep reducing the value of h until it becomes 1. An array is said to be h-sorted if all sublists of every h’th element are sorted.

Shell sort

Implementation of Shell Sort Algorithm in C

Question: C program to implement Shell sort using function.


Enter the number of elements: 6
Enter 6 Elements:

Array after sorting:
3 18 54 55 124 356

Time Complexity of Shell Sort:

  • Best case:  0(nlogn)
  • Average case:  0(n(logn)^2)
  • Worst case:  0(n(logn)^2)


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